<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>rectangle</title>
  <link rel="stylesheet" href="./layout.css">
</head>
<body>
<div id="main">
  <label>宽度：</label>
  <input type="text" id="width"><span>*</span>
  <br>
  <div id="width-validate"></div>
  <label>高度：</label>
  <input type="text" id="height"><span>*</span>
  <br>
  <div id="height-validate"></div>
  <label></label>
  <input type="button" id="calc" value="计算">
  <br>
  <label>周长：</label>
  <input type="text" id="perimeter" disabled>
  <br>
  <label>面积：</label>
  <input type="text" id="area" disabled>
  <br>
</div>

<script src="//apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
<script src="./main.js"></script>
</body>
</html>
